Al Isra, 110 Ayah
17:110
قُلِ ٱدۡعُواْ ٱللَّهَ أَوِ ٱدۡعُواْ ٱلرَّحۡمَٰنَۖ أَيّٗا مَّا تَدۡعُواْ فَلَهُ ٱلۡأَسۡمَآءُ ٱلۡحُسۡنَىٰۚ وَلَا تَجۡهَرۡ بِصَلَاتِكَ وَلَا تُخَافِتۡ بِهَا وَٱبۡتَغِ بَيۡنَ ذَٰلِكَ سَبِيلٗا ١١٠
Qul Ad`ū Al-Laha 'Aw Ad`ū Ar-Raĥmana ۖ 'Ayyāanan Mmā Tad`ū Falahu Al-'Asmā'u Al-Ĥusná ۚ Wa Lā Tajhar Bişalātika Wa Lā Tukhāfit Bihā Wa Abtaghi Bayna Dhālika Sabīlāan
Say, "Call upon Allah or call upon the Most Merciful. Whichever [name] you call - to Him belong the best names." And do not recite [too] loudly in your prayer or [too] quietly but seek between that an [intermediate] way.